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Journal of Clinical Microbiology, February 2000, p. 846-850, Vol. 38, No. 2
0095-1137/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

Capsule Expression by Bovine Isolates of Staphylococcus aureus from Argentina: Genetic and Epidemiologic Analyses

D. O. Sordelli,1,* F. R. Buzzola,1 M. I. Gomez,1 L. Steele-Moore,2 D. Berg,2 E. Gentilini,3 M. Catalano,1 A. J. Reitz,4 T. Tollersrud,5 G. Denamiel,3 P. Jeric,1 and J. C. Lee4

Departamento de Microbiología, Facultad de Medicina,1 and Departamento de Fisiopatología y Etiopatogenia, Facultad de Veterinaria,3 Universidad de Buenos Aires, Buenos Aires, Argentina; Christiana Care Health Services, Wilmington, Delaware2; Channing Laboratory, Brigham & Women's Hospital, Harvard Medical School, Boston, Massachusetts4; and National Veterinary Institute, Oslo, Norway5

Received 16 July 1999/Returned for modification 5 October 1999/Accepted 19 November 1999

Staphylococcus aureus is an important cause of bovine mastitis worldwide, and effective preventive or therapeutic modalities are lacking. Although most human S. aureus isolates produce capsular polysaccharides (CPs), few reports have described the prevalence of capsules on bovine isolates. This information is important for the rational design of a vaccine for the prevention of staphylococcal mastitis. We serotyped 195 S. aureus strains isolated between 1989 and 1997 from the milk of mastitic cows in Argentina. Only 14 (7.1%) of the strains were serotype 5, and all were recovered between 1989 and 1992. Thirteen serotype 8 strains were identified, and 12 of these were isolated between 1991 and 1994. The remaining 168 isolates were nonreactive (NR) with CP serotype 5 (CP5)- or CP8-specific antibodies. Hybridization studies performed with genomic DNA from eight NR strains revealed that only three of them carried the capsule genes. Pulsed-field gel electrophoresis (PFGE) performed with 127 of the 195 S. aureus isolates revealed that most (86%) strains belonged to one of four major PFGE groups. Although 8 of 14 CP5 isolates showed a common PFGE pattern (arbitrarily defined as A1), 31 other A1 isolates from the same time period (1989 to 1992) were not CP5 positive. In contrast, only nine PFGE type B3 isolates were recovered between 1990 and 1994, and eight of these were positive for CP8 (P < 0.0003). The results of this study underscore the variability in capsule expression by S. aureus strains isolated from different geographical regions and cast doubt on the roles of CP5 and CP8 in the pathogenesis and immunoprophylaxis of bovine mastitis in Argentina.

* Corresponding author. Mailing address: Departamento de Microbiología, Facultad de Medicina, Universidad Buenos Aires, Paraguay 2155 P-12, (1121) Buenos Aires, Argentina. Phone: 54 11 4963 6669. Fax: 54 11 4508 3705. E-mail: sordelli{at}fmed.uba.ar.

Journal of Clinical Microbiology, February 2000, p. 846-850, Vol. 38, No. 2
0095-1137/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.


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